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settler-Ryan/Geostrategies(1) Project: Tosco(l) 6747 Sierra Court,Suite 7 Project Number: Unocal SS#11195 Reported: Dublin CA,94568 Project Manager: Deanna Harding 02/26/01 14:46 Volatile Organic 8 Oxyganated Compounds by EPA Method 8260B - Quality Control Sequoia Analytical-San Carlos Reporting Spike Source °/uREC RPD Analyte Result limit Units Level Result %REC Limits RPD limit Notes Batch 1020041-EPA 5030B [PIT] Blank(1020041-BLK2) Prepared&Analyzed:02/14/01 Ethanol ND 1000 ugll 1,2-Dibromoethane ND 2.00 " 1,2-Dichlomethane ND 2.00 " Di-isopropyl ether ND 2.00 " Ethyl tert-butyl ether ND 2.00 " Methyl tert-butyl ether ND 2.00 " Tert-amyl methyl ether ND 2.00 " Tert-butyl alcohol ND 100 " Surrogate:l,2-Dichloroethane-d4 49.7 It50.0 99.4 76-114 Surrogate:Toluene-d8 49.5 1' 50.0 99.0 88-110 'S(1020041-BSl) Prepared&Analyzed:02/13/01 fihyl lert-butyl ether 49.4 2.00 ngfl 50.0 98.8 70-130 Surrogate:l.2-Dichloroethane-d4 50.0 50.0 100 76-114 Surrogate:Toluened8 48.7 50.0 97.4 88-110 LCS(1020041-BS2) Prepared&Analyzed:02/14/01 Methyl tert-butyl ether 46.4 2.00 ugll 50.0 92.8 70-130 Surrogate:l.2-Dichloroethane-d4 51.0 50.0 102 76-114 Surrogate:Toluene-d8 49.1 50.0 98.2 88-110 Matrix Spike(1020041-MSI) Source:L102061-12 Prepared&Analyzed:02/13/01 Methyl tert-butyl ether 49.3 2.00 ugll 50.0 ND 98.6 60-140 Surrogate:l,2-Dichloroethane-d4 48.3 50.0 96.6 76-114 Surrogate:Toluene-d8 54.3 50.0 109 88-110 i Matrix Spike Dup(1020041-MSD1) Source:L102061-12 Prepared&Analyzed:02/13/01 Methyl tert-butyl ether 48.7 2.00 ug/1 50.0 ND 97.4 60-140 1.22 25 Surrogate:1,2 Dichloroethaned4 50.6 50.0 101 76-114 Surrogate:Toluene-I18 49.0 50.0 98.0 88-110 Nuoia Analytical-Sari Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Page 17 of 18